JP4012826B2 - Vibration damping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping device. More particularly, the present invention relates to a vibration damping device for a motor vehicle that includes a battery as a vibration damping mass body, and the battery is fixed to a vehicle body via a spring element.
[0002]
[Prior art]
The automobile body tends to vibrate, and this vibration comes from the chassis and the internal combustion engine on the drive side. The vibration can cause discomfort to the passenger and impair comfort. Such vibrations are addressed by the appropriate design of the unit bearings and also by the added mass that absorbs the vibration energy that is elastically fixed to the front or rear of the body. However, such means are undesirable as they are limited in their effectiveness, have the disadvantage of requiring additional space and increase vehicle weight. It has therefore been proposed to use a mass already present in the vehicle, in particular a mass body with a high spatial weight or density, for example a vehicle battery, as a vibration damping device.
[0003]
There is a battery that is arranged in an appropriately designed storage portion and elastically supported on the vehicle side (see, for example, Patent Document 1). In the case of Patent Document 1, the storage portion forms a suitably designed elastic coupling link between the battery and the vehicle body or a portion of the vehicle body that transmits undesirable vibrations. In this case, the storage unit cooperates with the battery to form a damper device that acts against harmful vibrations. The elastic coupling link has a coil spring, which cooperates with the battery to form a vibration damping system that is adjusted to the vibration side, frequency of harmful vibrations. Instead of this coil spring, a molded body made of an appropriate elastic material can be used. There has been disclosed a battery-vibration damping device capable of supporting a battery with an elastic material from all sides in a casing-like storage portion (see, for example, Patent Document 2). In Patent Document 2, a battery is detachably fixed in a U-shaped storage portion, and this storage portion is suspended by a U-shaped bracket fixed to a vehicle at the front and rear portions via elastic bodies. Yes. The elastic body is arranged in one horizontal plane between the legs of the two U-shaped profiles and is elastic in all directions, so that the battery can move relative to the vehicle body in each driving axis direction. is there.
[0004]
A stopper is provided in all structures so that the vibration of the battery does not become too large, and this stopper limits the vibration process of the battery. This arrangement has the disadvantage that the battery is braked very strongly and can exceed the mechanical load limit of the battery. Therefore, in this configuration, a standard battery cannot be used, but rather a vibration resistant battery is required. Vibration resistant batteries are much more expensive than standard batteries, and the market for replacement parts required for vibration resistant batteries is not sufficient.
[0005]
[Patent Document 1]
German Patent Publication (DE-A1) No. 4340007 Specification [0006]
[Patent Document 2]
JP-A-2-197446 [0007]
[Problems to be solved by the invention]
The present invention is therefore a vibration damping device for motor vehicles, in particular with a battery as a vibration damping mass, so that the battery is not destroyed during the vibration damping process in a defined vibration stroke, thereby An object of the present invention is to provide a vibration damping device that can be used as a vibration damping mass body. It is desirable that the vibration damping device has a simple structure and can be manufactured by mass production.
[0008]
[Means for Solving the Problems]
An object of the present invention is to provide a vibration damping device for an automobile having a battery as a vibration damping mass body of the type described at the beginning, wherein the battery is fixed to the body of the automobile via a spring element. Solved by having at least two substantially linear spring characteristics within the body operating range, wherein the second spring characteristic is more rigid than the first spring characteristic. Is done. Alternatively, in a vibration damping device of the type described at the outset, the spring element is defined by a spring characteristic curve having at least two substantially linear characteristic curve sections in the operating range of the vibration damping mass. This is solved by the fact that the second characteristic curve section of the section exhibits higher rigidity than the first characteristic curve section. The operating range of the vibration damping mass body is divided into two sections showing different stiffnesses. First, in the first operating range showing more flexible rigidity, vibration damping is performed according to the first spring characteristic and the first characteristic curve section. And the vibration damping mass body swings more greatly to exceed the first operating range exhibiting flexible rigidity, and only in the second operating range exhibiting higher rigidity, the second spring characteristic, Vibration damping is performed according to the second characteristic curve section.
[0009]
In the present invention, these first and second characteristic curve sections can be made continuous with each other. However, a particularly good vibration damping action is achieved when a section in which the force changes abruptly between these two sections and the two characteristic curve sections are not continuous.
[0010]
The operating ranges of the first and second characteristic curve sections can be configured to have substantially the same size. The spring characteristics can be defined such that the operating ranges where the two spring characteristics are shown are approximately the same. However, depending on the application situation of the vibration damping device, other dimensions can be selected, for example a second operating range in which the second spring characteristic is shown, a first operating range in which the first spring characteristic is shown. The dimensions can also be selected to be narrower.
[0011]
As during the first and second characteristic curve Ward mutually angled, or such that the first characteristic curve section and a second characteristic curve section is stretched in a gradient which is oriented at an angle to one another the spring element is configured, in this case, the second spring characteristic, the second characteristic curve section, a first spring characteristic is stretched steeply than the first characteristic curve section.
[0012]
The characteristic curve section where the force changes suddenly between the first characteristic curve section and the second characteristic curve section is twice or more than the rigidity of the first characteristic curve section. It is selected to have the above rigidity. The rigidity of the second characteristic curve section is configured to be twice or more than the rigidity of the first characteristic curve section in any of the sections. A particularly good vibration damping action is achieved by this configuration.
[0013]
The spring characteristic of the present invention incorporates an end stopper section that is configured flexibly. This is based on the flexiblely configured end stopper providing better results than the hard end stopper.
[0014]
In the case of the actual embodiment, at least one spring element is provided in each direction of movement of the vibration-damping mass, and the impact on the battery is buffered by these spring elements.
[0015]
It is advantageous to provide a plurality of spring elements of the present invention in a vibration damping device, each spring element having the same structure with the same spring characteristics, so that in the two vibration directions of the vibration damping mass body, The impact damping process has the same effect.
[0016]
Various embodiments of the spring element of the present invention are possible. Embodiments in which the spring of the spring element consists of a rubber diaphragm with a peripheral ridge are advantageous. This peripheral ridge is preloaded in the assembled state so as to cause a sudden change in the intentional force.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The accompanying drawings show the mode of operation of the spring element and the actual embodiment of the spring element.
[0018]
At the top of FIG. 1, the force-stroke-spring characteristic curves or characteristic curve sections 1, 2, 3 and -1, -2, -3 of two identical spring elements acting in opposite directions are shown in the form of a graph. Show. In a stationary state, the battery exists at the origin where the force reference line and the stroke reference line intersect, and at the center of the graph. As the vibration damping mass, i.e. the battery swings or displaces to the right or left, the vibration damping mass reaches the first operating range A or B, respectively, in which the spring element exhibits a first characteristic. The operating range means the displacement from the origin of the battery, and the operating ranges A and B extend from 0 to 2 mm and from 0 to -2 mm. As the battery swings up, the opposite force increases. If this deflection exceeds the stroke length of 2 mm, i.e. if the displacement of the vibration-damping mass exceeds 2 mm, the spring element reaches the second operating range AA or BB exhibiting the second characteristic, this range Within, the spring characteristic has a greater force. The slope of the spring characteristic curve or the characteristic curve section, and the rate of increase or decrease of the spring characteristic are more rapid than the rate of increase or decrease of the spring characteristic in the first operating range A or B. At this time, the first characteristic curve section 1 and the second characteristic curve section 2 extend within the gradients 4 and 5 that are oriented at an angle γ. The test shows that a particularly good vibration damping effect is obtained by a change in stiffness in the spring characteristic curve sections 1, 2 and 3. In the two operating ranges A and AA, the spring element operates according to a substantially linear spring characteristic curve, characteristic curve sections 1 and 2, respectively. The second characteristic curve section 2 indicates that the spring element has a higher stiffness than the first characteristic curve section 1. The ranges A and AA in which the spring element operates according to the spring characteristic curve sections 1 and 2 are approximately the same size. The second operating range AA or BB extends in the range of 2 mm to 4 mm. When the vibration-damping mass is displaced in the range of 2 mm to 4 mm from the origin, the spring element operates according to the second characteristic curve section 2. The second actuating range AA is followed by a flexibly configured end stop section indicated by a range E or F, respectively. The flexible configuration in the end stopper section is based on how the spring characteristic curve changes near the boundary between the second operating range AA and the range E or F, or from the spring characteristic curve section 2 to 3 in the range near this boundary. From the fact that the spring characteristic curve 3 rises steeply as it is recognized from the easily curved shape, it is clear that in the end stopper section E or F, as the vibration of the vibration-damping mass body increases, the rigidity increases rapidly. It is.
[0019]
By referring to the vibration damping curve shown below the graph showing the force-stroke-spring characteristic curve, the curve showing the stroke amount with respect to time, the structure having the spring characteristic curve sections 1, 2, 3 It can be confirmed that the damping effect is improved. Even when the vibration-damping mass is shaken by about 5 mm and displaced from the origin, a good vibration-damping action is achieved in the shortest time in a very short time.
[0020]
The third velocity graph showing the velocity of the vibration-damping mass body with respect to time shows that it has a vibration-damping action with a significant fluctuation in speed compared with the conventional one. However, the bottommost acceleration graph showing the acceleration experienced by the vibration-damping mass with respect to time is particularly important, with only a few peaks protruding and even very small shakes. The acceleration received by the vibration damping mass is particularly important for the vibration damping behavior of the vibration damping device. It is particularly noteworthy that acceleration swings are reduced by the novel structure of the spring element of the present invention.
[0021]
FIG. 2 shows the spring characteristic curve sections 1, 6, 2, and 3 so that they can be compared with the spring characteristic curve sections of FIG. FIG. 2 differs from FIG. 1 in that it has a spring characteristic curve section 6 in which the stiffness of the spring element changes abruptly between the operating ranges A and AA indicated by the spring characteristic curves 1 and 2. An embodiment in which a vibration damping device is constituted by a spring element having characteristics is shown. The characteristic curve section 6 in which the stiffness changes abruptly shifts the second characteristic curve section 2 to the outside with a slightly larger displacement and a larger touch, and is the first in the second operation range AA. The spring element is configured to operate in accordance with a rigidity that is clearly higher than the operating range A. In the present embodiment, the rigidity of the second characteristic curve section 2 is twice or more higher than the rigidity of the first characteristic curve section 1 at any point. Furthermore, the first characteristic curve section 1 and the second characteristic curve section 2 can be configured so that the gradients thereof are parallel to each other. However, in this embodiment, the slope and the gradient β of the second characteristic curve section 2 are The slope and the gradient α of the first characteristic curve section 1 are selected to be larger. As a result, in the second characteristic curve section 2 showing the second spring characteristics, the rate of increase in rigidity is higher than in the first characteristic curve section 1 showing the first spring characteristics. At this time, the first characteristic curve section 1 and the second characteristic curve section 2 extend within the gradients 4 and 5 that are oriented at an angle γ. The two assumed gradients 4 and 5 of the characteristic curve sections 1 and 2 form an angle γ with each other. The second characteristic curve section 2 is followed by the end stopper section 3 that is configured more flexibly as the operating range E.
[0022]
The vibration damping effect achievable with this embodiment of the spring element is further illustrated in the graph of vibration damping mass travel, velocity and acceleration over time. Compared with the graph of FIG. 1, in the case of the vibration damping action shown in FIG. 2, the spring characteristic has a range in which the stiffness changes suddenly. Therefore, in all three graphs of stroke, speed and acceleration, It can clearly be seen that further reduction has been achieved. In particular, the graph relating to acceleration shows that there is a clear decrease in peak value.
[0023]
The above-described embodiments with respect to the characteristic curve sections 1, 6, 2 and 3 can likewise be applied to the spring characteristic curve of a spring element displaced in the opposite direction shown on the left side from the origin.
[0024]
FIG. 3 shows a possible configuration of the spring element 10. According to the configuration of the present embodiment, it has a spring characteristic having two linear characteristic curve sections 1 and 2, a characteristic curve section 6 in which the rigidity existing between the linear characteristic curve sections 1 and 2 changes rapidly, and an end stopper section 3 that is configured flexibly. It is possible to provide a spring element. The spring element 10 has a rubber diaphragm 11 provided with a peripheral ridge 12. This peripheral ridge 12 is preloaded in the holder 13. For this purpose, the holder 13 includes a base body 14 and a guide portion 15 fixed to the base body 14 with screws. The peripheral raised portion 12 is sandwiched between the holder 13, that is, the base 14 and the guide portion 15. The guide portion 15 is used to guide the plunger 16, and the plunger 16 is fixed to a battery (not shown). In FIG. 3, a perforation is provided in the base 14 above the rubber diaphragm 11, and this perforation is used to accommodate the rubber diaphragm 11 during the second operating range AA.
[0025]
The operating method of the spring element 10 is as follows. When the plunger 16 is moved towards the rubber diaphragm 11 by means of a vibration damping mass or battery not shown, this rubber diaphragm 11 acts in a first operating range A having a first characteristic curve section 1. To do. This operating range A is complete when the upper surface 18 of the rubber diaphragm 11 reaches approximately the point 17 and the rubber diaphragm 11 is oriented substantially horizontally. When further pressed by the plunger 16, the rubber diaphragm 11 further moves into the perforation 19, and the spring characteristic enters the characteristic curve section 6 where the stiffness changes abruptly. The surface 18 of the rubber diaphragm 11 reaches a point 20 in the perforation 19 when it is displaced beyond the characteristic curve section 6 where the stiffness changes rapidly. Next, the peripheral edge 21 of the rubber diaphragm 11 contacts the intermediate step 22 in the perforation 19. Thereby, the rigidity of the rubber diaphragm 11 is obviously increased, and the spring element operates according to the operation range AA, that is, the second spring characteristic curve section 2. By further movement of the plunger 16, the rubber diaphragm 11 is further pushed into the perforation, so that the upper surface 18 of the rubber diaphragm 11 finally reaches the perforation bottom 23, at which time the spring characteristic curve is in the end stopper range E. To reach. In the end stopper range E, the spring element operates according to the corresponding spring characteristic curve section 3. This embodiment illustrates only one side of the spring. The other side surface on the opposite side is configured symmetrically as in the present embodiment, and exhibits the same action as the present embodiment in the opposite direction. In addition, the spring elements similar to those of the present embodiment can be provided for other aspects.
[0026]
【The invention's effect】
The present invention relates to a vibration damping device for an automobile provided with a battery as a vibration damping mass body, in which the battery is fixed to the body of the automobile via a spring element, wherein the spring element (10) is a vibration damping mass. In the operating range of the body (A, AA and B, BB), at least two spring characteristic curves (1, 2, 3; 1, 6, 2, 3) having approximately linear characteristic curve sections (1, 2) ), And the second characteristic curve section (2) has higher rigidity than the first characteristic curve section (1) among the characteristic curve sections. With this configuration, it is possible to provide a vibration damping device in which the battery is not destroyed during the vibration damping process in a defined vibration stroke, so that a standard battery can be used as a vibration damping mass.
[Brief description of the drawings]
FIG. 1 is a graph showing the force against the stroke of a spring characteristic curve and the stroke, speed and acceleration over time for springs with different stiffnesses.
FIG. 2 is a graph showing a force with respect to a stroke and a graph showing a stroke, a speed and an acceleration with respect to time of a spring element having a spring characteristic whose stiffness changes abruptly between the first and second sections; is there.
FIG. 3 is a diagram showing the structure and arrangement of spring elements in a holder according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Spring element 11 Rubber diaphragm 12 Peripheral protruding part 13 Holder 14 Base | substrate 15 Guide part 16 Plunger 19 Perforation 23 Perforation bottom part

Claims (9)

A vibration damping device for an automobile equipped with a battery as a vibration damping mass body, wherein the battery is fixed to the body of the automobile via a spring element,
The spring element (10) has at least two substantially linear characteristic curve sections (1, 2) in the operating range (A, AA and B, BB) of the vibration damping mass body (1, 2, 3; 1, 6, 2, 3), and the second characteristic curve section (2) of the characteristic curve sections has higher rigidity than the first characteristic curve section (1),
Said spring element (10) is the only rubber diaphragm (11) attached to the base (14) with perforations which includes an intermediate stepped portion (22) and the perforated bottom (23) (19) Tona is, the first stiffness characteristic curve interval, but the rubber diaphragm (11) moves toward said perforations (19) previously shown to be engaged with the perforations (19), the second characteristic curve section The vibration damping device is characterized in that the rubber diaphragm ( 11 ) is shown to abut against the intermediate step ( 22 ) in the perforation ( 19 ) .   The operating range (A, B) of the first characteristic curve section (1) and the operating range (AA, BB) of the second characteristic curve section (2) are the same size. 1. The vibration damping device according to 1.   The gradient (4) of the second characteristic curve section (2) is larger by an angle (γ) than the gradient (5) of the first characteristic curve section (1). 2. The vibration damping device according to 2. A third characteristic curve section (6) exists between the first characteristic curve section (1) and the second characteristic curve section (2), and the gradient of the third characteristic curve section (6) is The vibration damping device according to any one of claims 1 to 3, wherein the vibration damping device is larger than a gradient (4, 5) of the first and second characteristic curve sections (1, 2). It said spring element (10) is, in the second characteristic curve section (2), according to claim 4, characterized in that it comprises two or more times the stiffness of the stiffness of the first characteristic curve section (1) serial mounting of the vibration damping device. The spring characteristic curve (1, 2, 3) has an end stopper section (3), the end stopper section (3) exhibits elasticity, and the first and second characteristic curve sections (1, 2, ) vibration damping apparatus according to any one of claims 1, characterized in that exhibits high rigidity to 5 than. The vibration damping device according to any one of claims 1 to 6 , characterized in that the spring element (10) is provided for each movement direction of the vibration damping mass body. It said spring element (10) is provided with a plurality of any one of claims 1 respectively, characterized in that is configured with the same structure with the same spring characteristic curve (1, 2, 3) to 7 Vibration damping device. Wherein with rubber diaphragm (11) is peripheral ridge (12), claims 1 to 8, wherein the peripheral protuberance (12) is characterized by being subjected to pre-load the mounted state The vibration damping device according to any one of the above.

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